"We are working closely with union representatives and our Governors' Council, which includes patients, staff and members of the public, to discuss this further.

"We will thoroughly consider all aspects of infection prevention and control, health and safety, and professional image if our dress code policy is to change."

A spokeswoman for Crocs shoes said allegations that the rubber shoes generated static electricity were unfounded but they were investigating to make sure their product was suitable for medical staff.

She said: "There are a number of factors that contribute to the build-up of static electricity, including temperature, humidity, flooring applications, types of material and the nature of the contact, so it is unlikely that any one factor is the sole cause.

"We know of no reason that Crocs would be any more susceptible to static electricity than other shoes, such as sneakers and other types of footwear worn by medical professionals."

She added that hospitals in Sweden recently reversed their decision to ban Crocs from their wards.